The Oulipo Compendium calls sentences that use each letter *only* once "isopangrams." (Pangrams hit every letter, but there are no restrictions on number of appearances.)

The Ou. Comp. cites two English examples from the Oxford Guide to Word Games: "Cwm fjord-bank glyphs vext quiz" and "Nth black fjords vex Qum gyp wiz"—neither seems as elegant as the ones in ETCetera!

In French, Jacques Jouet has been in pursuit of isopangrams, and in ESPIONS "has imagined situations involving spies (the word is used broadly) who, ever concerned with secrecy and security, are profesionally inclined to communicating in concise, cryptic messages. The quality of the isopangrams improves from one anecdote to the next as first proper names and then their abbreviations are eliminated. But not, alas, all abbreviations..."